package com.zoctan.api.common.response;

import lombok.extern.slf4j.Slf4j;

import org.springframework.core.MethodParameter;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestControllerAdvice;
import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice;

/**
 * 统一Web响应
 */
@Slf4j
@RestControllerAdvice
public class WebResponseBodyHandler implements ResponseBodyAdvice<Object> {

  @Override
  public boolean supports(MethodParameter returnType, Class<? extends HttpMessageConverter<?>> converterType) {
    ResponseBody responseBody = returnType.getMethod().getAnnotation(ResponseBody.class);
    log.debug("{} @ResponseBody: {}", returnType.getMethod().getName(), (responseBody != null));
    return responseBody == null;
  }

  @Override
  public Object beforeBodyWrite(Object body, MethodParameter returnType, MediaType selectedContentType,
      Class<? extends HttpMessageConverter<?>> selectedConverterType, ServerHttpRequest request,
      ServerHttpResponse response) {
    if (body == null) {
      log.debug("{} response null", returnType.getMethod().getName());
      return ResultGenerator.genOkResult();
    }
    if (body instanceof Result) {
      log.debug("{} response Result: {}", returnType.getMethod().getName(), body);
      return body;
    }
    log.debug("{} response Object: {}", returnType.getMethod().getName(), body);
    return ResultGenerator.genOkResult(body);
  }
}